package com.study.springboot02study.interceptor;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.logging.Log;
import org.slf4j.Logger;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import static jdk.nashorn.internal.runtime.regexp.joni.Config.log;

/**
 * 登录检查
 * 1、配置好拦截器要拦截那些请求
 * 2、把这些配置放在容器中
 */
@Slf4j
public class LoginInterceptor implements HandlerInterceptor {
    /**
     * 目标方法执行之前
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //String requerstURI = request.getRequestURI();
        //log.info("拦截的请求路径是{}",requerstURI);
        //登陆检查逻辑
        HttpSession session = request.getSession();
        Object loginUser = session.getAttribute("loginUser");
        if (loginUser != null){
            //放行
            return true;
        }
        //拦截。未登录，跳转登录页
        request.setAttribute("msg", "请先登录！");
        //response.sendRedirect("/");
        request.getRequestDispatcher("/").forward(request, response);
        return false;
    }

    /**
     * 目标方法执行之后
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    /**
     * 页面渲染
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
